Quiz Reveals Which Shopping Site Tracks Users via Inaudible Sound Frequencies

A recent economic trivia quiz by Calcalist posed the question of which online shopping website tracks its visitors by emitting sounds at inaudible frequencies. The quiz, part of Calcalist's weekly economic trivia series (#39), challenges readers to test their knowledge about digital privacy and tracking methods used by e-commerce platforms. Published on August 27, 2026, the quiz highlights concerns over covert tracking technologies that operate without users' awareness.